|Liu, Hsing Yeh|
Submitted to: Phytopathology
Publication Type: Proceedings
Publication Acceptance Date: June 12, 2007
Publication Date: July 28, 2007
Citation: Liu, H., Lewellen, R.T. 2007. Beet Oak-leaf Virus Suppresses Beet Necrotic Yellow Vein Virus in Sugar Beet. Phytopathology. 97:S65. Technical Abstract: Resistance-breaking isolates of Beet necrotic yellow vein virus (RB-BNYVV) were surveyed through out the sugar beet growing areas in the U.S. In addition to BNYVV, most soil samples were shown to contain Beet oak-leaf virus (BOLV) as well. BNYVV and BOLV often occurred concurrently in the same area and sometimes in the same sugar beet baited plants. The possibility of interactions between these two Polymyxa betae transmitted sugar beet viruses was tested. Plants grown in soils infested with aviruliferous P. betae and viruliferous P. betae carrying RB-BNYVV and BOLV, alone and in combination, were compared with plants grown in non-infested soil for differences in plant fresh weight and virus content as measured by ELISA. Rz1 and Rz2 that condition resistance to BNYVV did not confer resistance to BOLV. BNYVV ELISA values were significantly higher in single infections than in mixed infections with BOLV, in both the rhizomania-resistant and –susceptible cultivars. In contrast, ELISA values of BOLV were not significantly different between single and mixed infections in both the rhizomania-resistant and -susceptible cultivars. Results indicate BOLV may suppress BNYVV in mixed infections. Soils infested with P. betae significantly reduced fresh weight of sugar beet seedlings regardless of whether they were with or without one or both viruses or resistance genes.